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NOTES RECEIVABLE AND PREFERRED EQUITY INVESTMENT Schedule of Notes Receivable (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended |  |  | 1 Months Ended
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Dec. 31, 2011 properties | Dec. 31, 2009 extension_options | Dec. 31, 2011 properties | Dec. 31, 2010 | Dec. 31, 2009 extension_options | Sep. 30, 2011 | Dec. 31, 2008 | Dec. 31, 2011 Zero Coupon Loan [Member] | Dec. 31, 2011 Mezzanine Loan Due 2013 [Member] | Feb. 28, 2011 Mezzanine Loan Due With Capital Event [Member] | Dec. 31, 2011 Mezzanine Loan Due With Capital Event [Member] | Dec. 31, 2011 Mezzanine Loan Due 2017 [Member] | Dec. 31, 2011 First Mortgage Loan Due 2012 [Member] | Dec. 31, 2011 First Mortgage Loan Due on Demand [Member] | Sep. 30, 2011 First Mortgage Loan Due 2012 Second [Member] members_of_entity | Dec. 31, 2011 First Mortgage Loan Due 2012 Second [Member] | Oct. 31, 2011 Construction Loans [Member] extension_options | Dec. 31, 2011 Construction Loans [Member] | May 31, 2011 Mezzanine Loan [Member] | Dec. 31, 2011 First Mortgage Loan Due 2012 Third [Member] properties locations extension_options | Dec. 31, 2011 First Mortgage Loan Due 2012 Third [Member] properties locations extension_options | Dec. 31, 2011 Individually Less Than 3% [Member] | Dec. 31, 2011 Individually Less Than 3% [Member] Minimum [Member] | Dec. 31, 2011 Individually Less Than 3% [Member] Maximum [Member] | Apr. 30, 2010 First Mortgage [Member] | Dec. 31, 2009 First Mortgage [Member] | Dec. 31, 2010 First Mortgage [Member] properties | Sep. 30, 2011 Core Portfolio [Member] Georgetown Portfolio [Member] properties | Sep. 30, 2011 Core Portfolio [Member] Georgetown Portfolio [Member] Mezzanine Loan [Member] | Aug. 31, 2009 Pennsylvania First Mortgage Loan, Secured By Property [Member] | Aug. 31, 2009 Long Island, New York [Member] First Mortgage Loan Secured By Interest in Single Tenant Property [Member] | Jun. 30, 2009 South Carolina First Mortgage Loan, Secured By Property [Member] | Mar. 31, 2009 South Carolina First Mortgage Loan, Secured By Property [Member] | Sep. 30, 2010 Preferred Equity Investment [Member]
Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  |  | 24.00% |  | 10.00% |  | 15.00% |  | 15.00% |  | 17.50% |  | 12.00% |  | 10.77% |  | 7.00% |  | 7.00% |  |  |  | 20.51% |  |  |  |  | 6.00% |  |  | 10.00% | 12.00% |  |  |  |  |  |  |  |  |  |
Prior liens |  |  |  |  |  |  |  | $ 166,200,000 | [1] | $ 85,835,000 | [1] |  |  | $ 11,925,000 | [1] | $ 37,700,000 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of mortgages | 71,025,000 | 8,600,000 | 71,025,000 |  | 8,600,000 |  |  | 5,644,000 | [1] | 9,089,000 | [1] | 3,834,000 | [1] | 3,834,000 | [1] | 3,550,000 | [1] | 8,500,000 | [2] | 10,000,000 | [1] | 4,000,000 | [2] | 4,000,000 | [2] | 5,400,000 | [1] | 5,400,000 | [1] |  | 12,609,000 | [2] | 12,609,000 | [2] | 8,399,000 |  |  |  |  |  |  | 8,000,000 |  |  |  |  |
Carrying amount of mortgages | 59,989,000 | 125,221,000 | 59,989,000 | 89,202,000 | 125,221,000 |  | 125,587,000 | 3,563,000 | [1] | 9,089,000 | [1] |  |  | 3,834,000 | [1] | 2,173,000 | [1] | 8,500,000 | [2] | 10,000,000 | [1] |  |  | 4,000,000 | [2] |  |  | 5,400,000 | [1] |  | 12,609,000 | [2] | 12,609,000 | [2] | 821,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of locations sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties Collateralized | 29 |  | 29 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  | 14 |  |  |  |  |  |  | 3 | 5 |  |  |  |  |  |
Number of extension options |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate, first extension option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate, second extension option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate, extension option |  | 14.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Members of Entity Which Own Shopping Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assignment of Mortgage Loan |  |  |  |  |  | 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Collection of Required Payment |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,700,000 |  |  |  |  |  |  |  | 2,100,000 | 4,700,000 |  |  |  |  | 5,100,000 | 700,000 | 300,000 |
Mortgage Loans on Real Estate, Collections of Principal | 8,600,000 |  | 56,517,000 | 42,010,000 | 13,614,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,800,000 |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |
Mortgage Loans on Real Estate, Collection of Required Payment, Accrued Interest Portion | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Collection of Required Payment, Exit Fee Portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Equity Investment, Collection of Required Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,400,000
Preferred Equity Investment, Collection of Required Payment, Invested Capital Portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000
Preferred Equity Investment, Collection of Required Payment, Accrued Preferred Return Portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,400,000
Period of extension options |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Properties Collateralized, Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Mortgage Loans on Real Estate, Period of Original Term of Loan |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Interest only payable monthly, principal due on maturity.
[2] | Payable upon maturity.

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